Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for State of Origin: 2002 and 1997

Table B-10. Estimated Measures of Reliability for Shipment Characteristics by Commodity Group for State of Origin: 2002 and 1997

[Estimates are based on data from the Commodity Flow Survey. Because of rounding, estimates may not be additive]

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Code Commodity (2-digit SCTG) Value Tons Ton-miles Average miles per shipment
CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002 CV
2002
CV
1997
Std. error of percent change 1997-2002
  All Commodities 6.1 3.7 7.9 21.7 9.1 28.5 8.0 12.0 18.4 11.9 7.2 12.2
01-05 Agriculture products and fish 18.0 6.0 18.6 17.4 8.6 18.3 18.2 16.1 33.7 S 14.2 S
06-09 Grains, alcohol, and tobacco products 32.1 7.7 43.8 42.6 7.3 60.3 S 10.9 S 39.7 26.4 34.0
10-14 Stones, non-metallic minerals, and metallic ores 16.1 15.4 22.2 9.2 20.7 23.6 10.9 24.9 33.5 38.3 31.7 162.8
15-19 Coal and petroleum products 33.9 31.9 37.0 31.4 33.3 27.3 37.6 S S 43.6 30.5 31.5
20-24 Pharmaceutical and chemical products 16.0 6.0 24.8 17.6 25.1 11.0 25.8 49.3 17.0 21.2 12.1 20.6
25-30 Logs, wood products, and textile and leather 7.6 7.9 9.5 6.2 8.9 9.9 6.2 14.8 14.5 9.9 12.6 20.3
31-34 Base metal and machinery 12.3 6.2 17.3 S 13.8 S 44.4 32.8 117.3 24.7 9.3 15.2
35-38 Electronic, motorized vehicles, and precision instruments 8.4 11.8 11.8 12.9 12.2 10.4 10.2 23.2 13.1 5.5 5.8 9.0
39-43 Furniture, mixed freight and misc manufactured products 10.8 4.4 19.1 24.7 31.0 28.2 41.4 44.9 35.2 9.9 6.4 7.7
-- Commodity Unknown 30.2 25.2 10.4 S 28.7 S S 40.0 S 24.5 30.4 81.6

KEY:
– Represents data cell equal to zero or less than 1 unit of measure.
S Estimate does not meet publication standards because of high sampling variability or poor response quality.
CV Coefficient of variation of number

NOTE: The Introduction and appendixes give information onf confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

SOURCE: Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Individual State Data, December 2004.